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滇西羊拉铜矿是近年来发现的大型铜矿床。本文系统研究了该矿床不同岩石、矿石、矿石矿物及脉石矿物的稀土元素地球化学特征 ,研究表明 :矿区花岗闪长岩具有与壳幔型花岗岩类相似的稀土元素特征 ;早期形成的块状硫化物矿石及其矿物中稀土元素含量高 ,富集轻稀土 ,具有负Eu异常 ,与赋矿地层碎屑岩、硅质岩的稀土元素球粒陨石标准化配分模式相似 ,反映其成矿物质来源于上地壳 ;中晚期形成的夕卡岩矿石及破碎带充填 交代型矿石及其矿物中稀土总量低 ,相对富集重稀土 ,Eu异常不明显或有明显的正Eu异常 ,反映成矿物质可能来自上地幔。
The Yunnan Yangla copper deposit is a large copper deposit discovered in recent years. In this paper, we systematically studied the REE geochemical characteristics of different rocks, ores, ore minerals and gangue minerals in this deposit. The results show that: the granodiorite in the ore district has the characteristics of rare earth elements similar to the crust-mantle granites; The sulfide-like ores and their minerals have high content of rare earth elements, enrichment of light rare earths and negative Eu anomaly, which is similar to the standardization of REE chondrite standardization patterns of ore-bearing formation clastic rocks and cherts, reflecting the ore-forming material Originating from the upper crust, skarn deposits formed in the middle and late stages, and crustal filling metasomatic rocks with a low total rare earth content in their minerals, which are relatively enriched in heavy rare earths with no obvious Eu anomalies or obvious positive Eu anomalies reflecting mineralization The material may come from the upper mantle.